﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;
using System.Web;

namespace Com.CMS263.Util
{
    public  class ExportExcel
    {
        /**/
        /// <summary>
        /// 将一组对象导出成EXCEL      这是对外方法     在外面调用这个方法就行    得导入命名空间
        /// </summary>
        /// <typeparam name="T">要导出对象的类型</typeparam>
        /// <param name="objList">一组对象</param>
        /// <param name="FileName">导出后的文件名</param>
        /// <param name="columnInfo">列名信息</param>
        public static void ExExcel<T>(List<T> objList, string FileName, Dictionary<string, string> columnInfo)
        {
            ExExcel(objList, FileName, columnInfo, null);

        }
        /**/
        /// <summary>
        /// 将一组对象导出成EXCEL
        /// </summary>
        /// <typeparam name="T">要导出对象的类型</typeparam>
        /// <param name="objList">一组对象</param>
        /// <param name="FileName">导出后的文件名</param>
        /// <param name="columnInfo">列名信息</param>
        /// <param name="other">追加其他内容</param>
        public static void ExExcel<T>(List<T> objList, string FileName, Dictionary<string, string> columnInfo, string other)
        {
            if (columnInfo.Count == 0) { return; }
            if (objList.Count == 0) { return; }
            //生成EXCEL的HTML
            string excelStr = "";

            Type myType = objList[0].GetType();
            //根据反射从传递进来的属性名信息得到要显示的属性
            List<PropertyInfo> myPro = new List<PropertyInfo>();
            foreach (string cName in columnInfo.Keys)
            {
                PropertyInfo p = myType.GetProperty(cName);
                if (p != null)
                {
                    myPro.Add(p);
                    excelStr += columnInfo[cName] + "\t";
                }
            }
            //如果没有找到可用的属性则结束
            if (myPro.Count == 0) { return; }
            excelStr += "\n";

            foreach (T obj in objList)
            {
                foreach (PropertyInfo p in myPro)
                {
                    if (p.ToString() == "BuyUserID")
                    {

                    }
                    excelStr += p.GetValue(obj, null) + "\t";
                }
                excelStr += "\n";
            }
            if (!string.IsNullOrEmpty(other))
            {
                excelStr += other;
            }
            //输出EXCEL
            HttpResponse rs = System.Web.HttpContext.Current.Response;
            rs.Clear();
            rs.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
            rs.AppendHeader("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(FileName, Encoding.UTF8));
            rs.ContentType = "application/ms-excel";
            rs.Write(excelStr);
            rs.End();
        }
    }
}
